CHRONIC DISEASES OF THE AIR-PASSAGES. 135 



I have several times so far succeeded as to cure the disease for 

 a time ; and in one case, a horse of my own, the disease was so 

 completely removed, that I kept the animal in constant work for 

 more than a year afterwards. 



This horse was as badly broken winded as a horse could be. 

 He was kept on bran and oats and a moderate quantity of good 

 hay. In the spring he had some vetches and grass in the stable, 

 which was cool, and well ventilated. He was worked at first very 

 moderately ; but after two or three months he was ridden at a 

 full trot, and sometimes galloped without inconvenience. I have 

 seen another case of complete broken wind apparently cured by 

 turning the animal, in dry summer weather, into a field where 

 there was no water. This mare had been purchased as a subject 

 for some experiments relative to glanders, being so bad as to 

 be thought fit for nothing else. After the experiments were 

 finished I thought it right to kill her, when I found the lungs, 

 and all the parts connected with them, perfectly sound, and at 

 the time she was killed not a symptom of broken wind could be 

 discovered. I have seen other broken-winded horses treated in 

 a similar manner, and with the same result ; and I have known 

 broken-winded horses apparently cured by being kept at grass 

 a short time, but get as bad as ever a little time after they had 

 been taken back into the stable. 



If the cough be troublesome, the ball advised for chronic 

 cough may be administered occasionally. 



Thick Wind. 



[This disease is very diiferent from broken wind, although 

 they are often confounded together. It is characterised, not by 

 a double, but a quickened respiration, it being frequently treble 

 or quadruple its natural state. It is, indeed, more serious than 

 broken wind, inasmuch as it has usually been preceded by an 

 inflammatory attack, which may again recur. 



The lungs of thick-winded horses have their capacity for air 

 diminished — the structure of the lungs is changed — a part 

 becomes heavy, indurated — the air-cells and bronchial passages 

 become filled up, so that the lungs no longer afford the same room 

 for the reception of the atmospheric air, and, inconsequence, the 

 horse is obliged to breathe doubly or trebly as quick as in a 

 state of health. 



This disease is usually the effect of an inflammation of the 

 lungs; but sometimes thick wind comes on without any acute 

 inflammatory attack. In such cases there has usually been 

 chronic bronchitis, which has probably been mistaken for a cold, 

 and has not left the horse until it has sadlv altered the structure 

 of the lungs. 



K 4 



